钢骨建筑抗震评估与耗能减震构件简化模拟

Seismic Evaluation and Simplified Analysis of an Existing High rise Steel Building Retrofitted with Seismic Energy Dissipated Devices

摘要:

对一座超高层钢骨建筑改建工程进行抗震设计与性能评估.进行了三维结构非线性静、动力分析以检核其抗震性能.非线性动力分析结果显示,最大考虑地震作用下，梁端最大弯矩塑铰约达0.010 rad、屈曲约束支撑最大核心段应变达1.25%、偏心斜撑连杆梁的最大剪力塑铰为0.065 rad，皆未超过AISC抗震规范所订构件性能要求或实验所得其变形能力.介绍了此改建结构的计算模型、模拟方法、非线性分析所得结构整体与主要构件的性能表现，其中亦提出梁柱节点及偏心斜撑构架剪力连杆梁等构件加固前后的简化模拟方法，并利用梁柱节点加固试验结果加以比较验证.

Abstract:

Buckling restrained braces (BRBs), eccentrically braced frames and moment connections retrofitted using two side plates were incorporated into the seismic retrofitting design of a 34 story hotel tower in Kaohsiung, Taiwan. This paper discusses the analytical models for simulating the experimental responses of the BRB members, shear link beams of the eccentrically braced frames(EBFs), and the welded moment connections before and after being retrofitted by side plates. Nonlinear response history analyses (NLRHA) indicate that the peak total beam end flexural rotation demand reaches 0.01 rad, the BRB peak core strain demand is about 1.25% and the link beam total shear rotation demand reaches 0.065 rad under the maximum earthquakes, which are less than those found in the seismic building codes or laboratory tests.